I have two grows currently. Same genes. All are quadlined. Drip feed. Both CO2 supplemented. Same nutes, same ppm per feed, they even drink the same amount of water - 6l a day in a 5gal pot and I am just in day 14 from flip.
I'm currently flowering grow 1 with 70% humidity, 28c and grow 2 with 50% humidity and 24c.
The grow with 70% humidity is just killing it compared to the 50% grow in terms of stretch, new growth, overall plant size and branching.
Low humidity in the first 4 weeks for me seems to be a bummer.
Thats the schedule I use and from my first coco grow, using
@Cultivator feeding schedule I yielded my first coco grow yielded 2.8k out of 5x600w and 890g out of 1000w.
Thats the schedule I go by
Veg: 81 F, 70 RH, 1000 ppms CO2
W1-3: 81 F, 70 RH, 1000 ppms CO2
W4: 81 F, 65 RH, 1000 ppms CO2
W5-6: 78 F, 60 RH, 1000 ppms CO2
W7: 75 F, 55 RH, 400 ppms CO2
W8-8.5: 75 F, 55 RH, 400 ppms CO2, RO flush
I believe your humidity is tightly connected with the temperatures your room have, so one cannot say go for 40% humidity or go for 70% cause thats not all that matters and it is very individual and dependent on the temperatures.